Volume-IF - JantERmantER

3.11.0 Culverts
DCPL-K4A02
for the drains shall be as per Dwg. and as mentioned in the Schedule of
items. Lining of drains may be of bricks or cement concrete blocks of M15
grade concrete as shown on drawing or as directed by the Engineer. If
instructed by the Engineer or shown on drawing, drains may be of R.C.C.
construction with necessary slopes.
Excavation in trenches for foundation of culverts and wing walls shall be
done with side slopes as per the instructions of Engineer after clearing the
site, etc. as per specifications of earthwork. Backfilling with ramming and
watering shall be done after construction of the foundations.
The construction of culverts shall be done true to lines and levels and as
shown on the drawing. The specification for Masonry and/or Plain and
Reinforced Cement concrete shall be followed, as applicable.
3.12.0 Pipe Culverts and Drainage Pipes
3.12.1 Materials
The drainage pipes unless otherwise shown on drawings or instructed by the
Engineer shall be made of R.C.C. and shall be either Class NP2 or NP3.
Pipe culverts shall be made of reinforced concrete pipe and shall be of class
NP3 or of RDSO class for railway as decided by the Engineer or shown in
the drawing. All pipes shall meet the requirements of IS:458- Latest edition
and shall be procured from approved manufacturers with collars as per
manufacturer's standard specifications. The tenderer shall specifically
mention the particular manufacturer's product he proposes to use. Cement
shall be ordinary Portland Cement as per IS:269 - Latest edition.
Aggregates shall be as per IS:383 - Latest edition - Maximum size shall not
exceed one third the thickness of the pipe or 20 mm whichever is smaller.
Fine aggregates for concrete shall be as per IS:383 - Latest edition.
3.12.2 Laying of Pipes
Laying of concrete pipes shall correspond to IS:783 - Latest edition - and
to specification given below :
a) The foundation bed for pipe shall be excavated true to lines and
grades shown on the drawings or as directed by the Engineer.
When trenching is involved its width on either side of the pipe shall
not be less than 150 mm nor more than one-third the diameter of pipe
unless otherwise instructed/permitted by the Engineer. The sides of the
trench shall be as nearly vertical as possible. Side slope, shoring,
bailing out water, etc. as required shall be done by the Contractor
without the Owner. Side slips, if there be any, shall be removed by the
(PCA.775.S034sca7) V.II-D2/S-VII : 25